Feature:1. 3 in 1 Design: This carbon dioxide detector has a 3 in 1 design with an infrared sensor to detect temperature, humidity and carbon dioxide.2. LCD Display: The portable mini CO2 detector has a LCD display, which is highly accurate display, easy to read, and can be manually calibrated.3. Compact and Portable: The 3 in 1 CO2 detector's small size makes it easy to carry as a decoration to check air quality anytime, anywhere.4. Large Capacity Battery: Digital CO2 meter adopts rechargeable battery, which can be used for 24 hours on a single charge and has a long service life.5. Multi Purpose: Suitable for home, school, office, tourism, indoor and outdoor, agricultural planting, production warehouse and other occasion.Specification:Item Type: Infrared Mini CO2 DetectorMaterial: ABS, PCSize: Approx. 73 x 73 x 18mm/2.9 x 2.9 x 0.7inDisplay: LCD DisplayPrep Time: About 35sRefresh Rate: About 2sCalibration: Manual CalibrationCO Concentration Measurement Range: 400-5000 ppm(50 ppm)Number Accuracy: (50 ppm+5%)Battery Capacity: 1000 mAh Li ion Battery (Included)Charging Method: USB Type CInput Voltage: DC5V 0.5AGross Weight: Approx. 113g/3.9oz.Package List:1 x Host1 x USB Cable1 x ManualNote:Please allow some errors due to manual measurement.